He studied at the Academy of Fine Arts Vienna under Anton Dominik Fernkorn.
Among his first major commissions was a program of architectural sculpture for the 1877 Vienna Stock Exchange, a collaboration with the Danish-Austrian Neoclassical architect Theophil Hansen.
The program included a quadriga, six full-figure statues, and a series of frieze panels around the cornice line.
The same year Friedl had also begun a long-term working relationship with Viennese architects Fellner & Helmer for theaters across Europe, transmitting variations of the Viennese Neoclassical Ringstraße Style to Sofia, Brno, Berlin, etc.
He was buried with honors at the Vienna Central Cemetery, with a portrait relief on his tomb by sculptor Leopold Kosig.